Facebook itself is great, personally, and for business, but you need to be REALLY careful about Apps.

If you don't even know what a Facebook App is, but you've used facebook in the past, then you still need to read the link above because you've probably already signed-up to an App without even knowing about it, and if you haven't signed-up then you still need to know how this works because one of your friends probably has.

just choose the "hide all from..." option (which comes up on the top-right of those posts when you mouse-over the post) when you see that kind of stuff in facebook, and don't allow access to apps; 99% of it is just lies and a bunch of viral advertising scams.

if you want to share a video/pic/story with your friends on facebook, then just paste/share the link to it; the app option is totally bogus, and just a scam.

personally I think facebook will regret letting the scammers run-riot with this stuff; facebook might get a lot of money in the short term, but in the long term it'll drive people off apps completely. by allowing apps to scam/spam people, and by letting them get away with some really dodgy practices, facebook will pretty much kill their apps income stone-dead once everyone realises what's going on.